Earlier quoted context omitted.
Yeah I'm not totally convinced humans don't have a tremendous amount of training data - interacting with the world for years with constant input from all our senses and parental corrections. I bet if you add up that data it's a lot. But once we are partially trained, training more requires a lot less.
Someone added it up: https://osf.io/preprints/psyarxiv/qzbgx > Large language models show intriguing emergent behaviors, yet they receive around 4-5 orders of magnitude more language data than human children.
Humans get a lot more input that just language is the point. We get to see language out in the physical world. They have the (really quite difficult) task of inferring all the the real world and its connections, common sense, laws of physics, while locked in a box reading wikipedia.
How capable do you think a child would be if you kept them in a dark box and just spoke to them through the keyhole? (not recommending this experiment)